saplinglearning.com University of Nebraska, Lincoln - CHEM 254 - Organic Chemist
ID: 570307 • Letter: S
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saplinglearning.com University of Nebraska, Lincoln - CHEM 254 - Organic Chemistry II Lab-Spring18- HARTUNG: Experiment 8 When Comparing SN1 Versus SN2 Reactions, Which One... Chegg.com Sapling Learning macmillan learning Jump to. ?) McKenzie Brown 2/24/2018 11:55 PM 0 02/18/2018 05:18 PM Gradebook Assignment Information Question 8 of 8 Available From: 2/18/2018 12:05 AM Due Date: Points Possible: 20 Map 2/24/2018 11:55 PM Sapling Learning Cyclopropane thermally decomposes by a first order reaction to form propene. Grade Category: Default Description: Policies: If the rate constant is 7.6 s, what is the half- life of the reaction? Test Number You can see if your answers are correct once the solutions are available. You can view solutions after the due date. How long does it take for the concentration to reach 0.25 of its initial value? eTextbook Number Help With This Topic Web Help & Videos Technical Support and Bug Reports PreviousextSave And Exit © 2011-2018 Sapling Learning, Inc. about us careers privacy policy terms of use contact us helpExplanation / Answer
(A)by the unit of the rate constant we know that it is a first order reaction and for first order reaction
half life = 0.693/rate constant = 0.693/7.6 = 0.0911 s
(B) by using the relation t=(1/K)*ln(N0/N)
here N0=N0 and N= 0.25*N0 and K=7.6 s^-1
t= (1/7.6)*ln(N0/0.25N0)
t= 0.1315*1.386
t= 0.1824 seconds
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